Columbia

Columbia was the fourth continent in earths history, during the Proterozoic Eon. Columbia was the continent for most of the Proterozoic Eon, breaking up around 600 million years before the end of the Proterozoic. It existed 2.1 billion years ago to 1.4 billion years ago, from the Paleoproterozoic to Mesoproterozoic Eras. It had many craters as well at the time, and was a similar, if not bigger, size as Kenorland.